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The very sad part about this is, 1) You have to buy RSLogix500, 2) You have to buy the proper cables and adapters, 3) You will not get the labels for the program, so your just going to see the logic, without any easy way to figure out what you are looking at.(unless you are a genius, unlike me)

Most laptops nowadays will not have a serial port, so you have to have a USB to serial adapter.

Contact the manufacturer of the equipment, and ask them for a copy of the .rss file.

Some company's will require you to sign a non-share agreement before they give it to you. As I explain to them, (although I always sign it anyways) we own the equipment, ALL OF THE EQUIPMENT, so we need it for maintenance.

Again, just my two cents, coming from the maintenance side of this type of problem.

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For the ML1200, you can probably use the cheapest version of RSLogix 500 (not the free one, alas, that one only supports the 1000 and 1100). A good USB-serial adapter is the Keyspan USA-19HS ($25 on Amazon). You'll need a cable too. If you get it from Rockwell, it will be expensive, but this one from Industrial Concepts should be fine. We've used other cables from them with no issues.

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Just adding mi dos centavos, but if you do get an uploaded backup copy of the program. Find a day and spend it documenting the inputs and outputs. Assuming you got schematics with the machine, you can at least document real world I/O in your copy. From there a good programmer can deduce what 50% or better of the internals do. I've found some documentation is better then none, even while not ideal.